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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Female Epeorus frisoni Mayfly Spinner Pictures

I collected this female spinner together with a male dun, a female dun, and another male dun.

Lateral view of a Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York
Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York
Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York
Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York
Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York
Ruler view of a Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York The smallest ruler marks are 1 mm.
Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York
Ventral view of a Female Epeorus frisoni (Heptageniidae) Mayfly Spinner from Mystery Creek #23 in New York

This mayfly was collected from Mystery Creek #23 in New York on September 6th, 2006 and added to Troutnut.com by Troutnut on October 3rd, 2006.


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Female Epeorus frisoni Mayfly Spinner Pictures

Collection details
Location: Mystery Creek #23, New York
Date: September 6th, 2006
Added to site: October 3rd, 2006
Author: Troutnut
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